Thank you for choosing to install a Max Machinery precision fl ow meter. To ensure the best experience please take a
moment to read through this manual prior to installation.
When you purchased this meter a fl ow engineer helped determine many of the factors that will be reviewed on the
following pages. You may fi nd it useful to fi ll out the form below and keep it in your fi les for reference.
When you are ready to install there will be a few tools you will need:
Meter Installation:
The meter and transmitter
A signal cable (available from factory)
The display or signal processing device
Indicator Manual
Calibration Certifi cateBypass plumbing supplies
Many Max meters are installed and operate for decades, so having the following information in your records may prove
useful. We have provided this outline as a starting point.
Process Temperatures ___________________________ Fluid Viscosity ____________________________________
Operating Range ________________________________ Line Pressure ____________________________________
Max Sales # or PO # _____________________________ Installation Date __________________________________
Meter Model # __________________________________ Meter Serial # ____________________________________
The Max P-Series of Flow Meters are positive displacement
piston type units capable of great accuracy over a wide range
of fl ow rates and fl uid viscosities. The fi ve basic sizes of this
series will measure fl ows from 0.005 cc/min to 35 Liter/min.
Various “O” ring and internal plating options are available to
meet temperature and fl uid compatibility requirements.
In a piston type fl ow meter, four pistons and cylinders are
arranged in a radial fashion around a central crankshaft.
Two fl uid ports on the cylinder wall, a port at the top of the
cylinder, and a grooved piston enable fl uid entering the fl ow
meter’s central cavity to be measured and pumped out by
each piston in turn. The valving action for each cylinder is accomplished by the piston adjacent to it. The accuracy of
a piston fl ow meter is dependent on close tolerances in the cylinder wall and piston. Max Machinery regularly holds
tolerances as fi ne as 0.00005 inches in the production of these meters.
The movement of the pistons is converted to a circular motion at the
central crankshaft, which is coupled to a magnet in the fl ow meter. This
motion is sensed by an external electronic transmitter, which converts
fl ow into a voltage, pulse train, or current for further processing.
The Max P Series of meters can be expected to perform superbly if
operated within the confi nes of their design envelope. For this reason,
it is important to read this manual and understand the operational
requirements and limits of the meter. Our Technical Service staff will be
happy to answer any questions that this manual does not cover.
Max transmitters are designed to work with the entire family of Max Flow Meters to provide extremely precise fl ow
measurement in a cost effective package. Different options of industrial housings or IP66 rated explosion proof
enclosures, combined with a choice of one-part and two-part, high temperature designs with remote electronics cover a
wide range of application environments – from the laboratory to harsh industrial processes.
This latest generation of transmitters use modern sensor technology coupled with advanced signal processing to deliver
high levels of performance and reliability. Hall sensors are used to detect the position of a driven magnet inside a Max
Flow Meter. Changes in position are tracked by a microprocessor, which generates an output proportional to the fl ow
rate. Advanced signal processing provides both fi ne angular resolution (0.36 degrees rotation) and rapid response
(output updated every one millisecond).
The Max transmitter will be mated to a mechanical fl ow meter, confi gured, and calibrated at the factory as a set.
This ensures accuracy and allows quick setup in the fi eld. For fi eld installations where the transmitter has not been set
up with a meter at the factory, an optional serial interface kit may be purchased to give full access to confi guration
options and parameters.
Transmitter Features
High resolution measurement –
Analog Output: Programmed output ranges to any value within ± 10 Vdc or ± 20 mA.Frequency Output: Programmed output resolution of 1 to 1000 pulses per revolution.
Linearization of up to 16 points to fully describe the fl ow meter’s output curve and achieve the highest system linearity over the meter’s entire operating range.
Compensation Algorithm – Compensates for variations in Hall sensor and fl ow meter characteristics to provide a stable,
undamped output that accurately represents the instantaneous fl ow rate. This feature is factory set when the meter
and transmitter are mated together. If the transmitter is changed, the compensation can be performed via a button on
the circuit board.
Anti-Dither Buffer - Masks the false output that may occur at very low fl ow rates in the presence of vibration or hydraulic
noise. If the meter reverses direction the output signal will be interrupted for a user selected portion of a meter rotation.
Reverse fl ow exceeding the buffer setting will result in an output proportional to reverse fl ow rate. The buffer quantity
can be set from 1% to 100% of a revolution.